Mac mini doesn't recognize Kindle Fire via USB cable
I can't directly connect my Kindle Fire to my Mac mini using an USB sync/charge cable. The tablet doesn't show up on my desktop or system profiler. I've tried restarting the tablet and I've tried different cables. I installed Android file transfer app but app doesn't "see" my tablet. Does anyone have a suggestion? Thx
Mac mini, macOS Sierra (10.12.6)